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This course is designed to introduce you to one of the most important—and unseen--contributors to the reduction of wastewater organics, the wastewater microorganisms. Biological wastewater treatment can be as simple as natural ecosystems such as marshlands, or as complex as engineered systems of microorganism cultivation and harvesting. The course will introduce the role of bacteria and protozoa in biological wastewater treatment, the latter of which is used as performance indicator organisms. The course will focus on the identification, structure, and function of the performance indicator microorganisms. We’ll also look at some nuisance microorganisms that interfere with the cultivated microbiology and their negative impact on your system effluent.